In general, OMAP chips are superior to Qualcomm ones.
They usually give slightly better performance at slightly less battery drain and support all the modern standards.

However, the first-gen QSD processor in that is indeed faster, the extra ram makes it even beefier. But its much more thirsty and very slow by today's standards (1.4GHz Dual-Exynos).

Its the community and the software which kept it alive, and had Nokia released an N900 successor, we would be in the same/better state.

What I proposed back in Jan 11 for successor:
1.3GHz Cortex A8, SGX540 and 1GB RAM
32GB internal + microSD + microUSB-HOST + microHDMI
4.3in SLCD 854x480, compass, 1,700mAh
17mm thin profile, tilt-screen, 5-row qwerty
open source drivers for Harmattan